Table 3 gives an overview of Infineon’s ISOFACE™ dual-channel digital isolators’ features and benefits for the customers:Īpplication examples of ISOFACE™ dual-channel digital isolators Featuring a creepage and clearance distance of 4 mm, they are well-suited for applications requiring basic isolation, such as low voltage DC-DC brick, high-side floating drive, and isolated UART/CAN communication. The dual-channel digital isolator family is certified according to the UL-1577 and IEC 60747-17 (VDE 0884-17) standards on the component level and also have system certification, such as IEC 62368-1 for telecom and server applications. Product variants with different channel configurations, fail-safe default output states, and variable or fixed input thresholds are available, as listed in Table 2. In addition, functions like glitch filter, communication modulation, watchdog, and under-voltage lockout (UVLO) are integrated to ensure a robust and fail-safe data transmission even in the critical industrial environment where high voltages and noises are present. This approach transmits signals between the input and output through the transformer across the isolation barrier. This innovative technology uses semiconductor manufacturing processes to integrate an on-chip transformer consisting of metal spirals separated by a silicon dioxide (SiO 2) insulation barrier, as illustrated in Figure 2. The new products utilize Infineon’s patented coreless transformer (CT) technology. To meet the continually growing isolation requirements in industrial applications, Infineon has released the first generation of dual-channel digital isolators that combine high robustness, precise timing performance, and low power consumption. Infineon’s first generation ISOFACE™ digital isolators 2DIBx4xxF The key differences between optical and digital isolators are summarized in Table 1. › More integrated features like input filters, transceivers (e.g., CAN, RS-485), and output enable options. › Solid insulation lifetime certified by component level standard IEC 60747-17 › Enhanced common-mode transient immunity (CMTI) › Accurate timing characteristics with lower power consumption › Optimized system BOM and reduced PCB area Recently they have been the preferred choice in many applications due to the following advantages compared to optical isolators: These technologies allow significant size reduction of the isolation element while achieving a long lifetime. On the other hand, digital isolators use either capacitive or magnetic isolation technologies to transfer signals across the isolation barrier. While there are techniques to integrate the external biasing and drive circuitry in a single package for minimizing the PCB size and achieving high data rates, this significantly increases the cost of the solution. This requires additional PCB area and increases the bill of materials (BOM) of an application. Moreover, optical isolators require additional onboard circuit elements to provide proper biasing and drive the integrated LED. However, the switching speeds of the LED limit the achievable data rate to only a few megabits per second. They have been widely used in the industry for decades due to their early market presence and competitive price position. Optical isolators, commonly called optocouplers, are analog isolation products that use light to transmit signals over the isolation barrier. In general, the isolators could be broadly classified into two different types: optical isolators and digital isolators. Additionally, they provide the necessary safety protection for humans interacting with high-voltage systems, as well as level-shift functionality, enabling interaction between systems powered by different supply voltage levels. By stopping the DC and uncontrolled AC current between the two parts of the circuit, isolators allow only communication signals and power to pass over the isolation barrier. This is where isolators (i.e., isolated gate driver ICs or digital isolators) come into play, as illustrated in Figure 1 (right). As depicted in Figure 1 (left), the DC return current from the input to the output can cause a potential difference between the two grounds, leading to low signal integrity and degraded quality. Effective galvanic isolation is crucial in high-voltage applications to prevent unwanted leakage currents from flowing between two parts of a system with different ground potentials (GPD).
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